Package ch.k43.util
package ch.k43.util
Java Utility Package (Open Source)
A high-performance, user-friendly programming toolkit designed for Java back-end developers.
This package holds all classes used by the Java Utility Package. The full documentation with examples can be found on java-util.k43.ch
1. Logging Example
KLog.info("Program started at {}", new Date());
KLog.debug("Any debugging message");
2025-04-25T09:52:08.753 D main[1]:ch.k43.util.KLog:init:197 ===== Application started 2025-04-25T09:52:08.711 =====
2025-04-25T09:52:08.753 D main[1]:ch.k43.util.KLog:init:198 Java Utility Package (Open Source/Freeware) Version 2025.04.25
2025-04-25T09:52:08.753 D main[1]:ch.k43.util.KLog:init:199 Homepage java-util.k43.ch - Please send any feedback to andy.brunner@k43.ch
2025-04-25T09:52:08.753 D main[1]:ch.k43.util.KLog:init:202 KLog properties read from file KLog.properties
2025-04-25T09:52:08.792 D main[1]:ch.k43.util.KLog:init:218 Network host ab-macbook-pro (10.0.0.108)
2025-04-25T09:52:08.792 D main[1]:ch.k43.util.KLog:init:222 OS platform Mac OS X Version 15.4.1/aarch64
2025-04-25T09:52:08.793 D main[1]:ch.k43.util.KLog:init:227 OS disk space total 3.63 TiB, free 2.30 TiB, usable 2.30 TiB
2025-04-25T09:52:08.793 D main[1]:ch.k43.util.KLog:init:233 Java version 23 (Java HotSpot(TM) 64-Bit Server VM - Oracle Corporation)
2025-04-25T09:52:08.793 D main[1]:ch.k43.util.KLog:init:238 Java directory /Library/Java/JavaVirtualMachines/graalvm-jdk-23.0.1+11.1/Contents/Home
2025-04-25T09:52:08.794 D main[1]:ch.k43.util.KLog:init:243 Java CPUs 10, de/CH, UTF-8, UTC +02:00 (Europe/Zurich)
2025-04-25T09:52:08.794 D main[1]:ch.k43.util.KLog:init:253 Java heap maximum 16.00 GiB, current 1.01 GiB, used 9.95 MiB, free 1022.05 MiB
2025-04-25T09:52:08.794 D main[1]:ch.k43.util.KLog:init:260 Java classpath ../bin/:../lib/angus-mail-2.0.3.jar:../lib/jakarta.mail-api-2.1.3.jar
2025-04-25T09:52:08.794 D main[1]:ch.k43.util.KLog:init:264 Current user andybrunner, language de, directory /Users/andybrunner/
2025-04-25T09:52:08.794 D main[1]:ch.k43.util.KLog:init:270 Current directory /Users/andybrunner/Documents/Eclipse-Workspace/Java-Utility-Package/src/
2025-04-25T09:52:08.795 D main[1]:ch.k43.util.KLog:init:274 Temporary directory /var/folders/9s/tbyqn_vn7bs9rf3f1rc2jpxw0000gn/T/
2025-04-25T09:52:08.800 I main[1]:Test:main:18 Program started at Fri Apr 25 09:52:08 CEST 2025
2025-04-25T09:52:08.800 D main[1]:Test:main:19 Any debugging message
2. JDBC Example
try (KDB db = new KDB(KDB.JDBC_H2, "jdbc:h2:mem:mydb", "", "")) {
KLog.abort(!db.isConnected(), "Error: {}", db.getErrorMessage());
db.exec("CREATE TABLE addresses (sequence INT AUTO_INCREMENT, lastname VARCHAR(20), firstname VARCHAR(20))");
db.prepare("INSERT INTO addresses (lastname, firstname) VALUES (?, ?)");
db.execPrepare("Smith", "Joe");
db.execPrepare("Miller", "Bob");
db.execPrepare("Johnson", "Evelyn");
db.exec("SELECT * FROM addresses");
System.out.println(db.getDataAsJSON());
}
3. HTTPS Example
KHTTPClient http = new KHTTPClient();
if (!http.get("https://reqbin.com/echo/get/json")) {
KLog.error("Error: {}", http.getLastError());
} else {
System.out.println(http.getResponseDataAsString());
}
4. SMTP Example
KSMTPMailer mailer = new KSMTPMailer();
mailer.setFrom("john.doe@acme.com");
mailer.setTo("bob.smith@hotmail.com");
mailer.setSubject("Subject");
mailer.addText("Here is your requested file");
mailer.addFile("test.txt");
mailer.addText("Regards, John");
mailer.send();
- Author:
- andy.brunner@k43.ch
-
ClassesClassDescriptionStatic class with many utility methods.Class to support all JDBC compliant databases with basic database functions.Static class with a collection of file utility methods.Hello World example.Support basic HTTP/HTTPS client transactions.Class to handle user HTTP connections accepted by KSocketServerListener.Simple HTTP web server to serve files.Static class for simple logging.Format logging output as single CSV line with UUID, time stamp, logging level, code location and the logging information.Java logging handler to output logging data to any compliant JDBC database.Format logging output as JSON formatted string with UUID, time stamp, logging level, code location and the logging information.Format logging output as single formatted line with time stamp, logging level, code location and the logging information.Java logging handler to send logging data to an SMTP host.This thread is started by the SMTP logging handler to send the SMTP mail.Format logging output as XML formatted string with UUID, time stamp, logging level, code location and the logging information.Format logging output as YAML formatted string with UUID, time stamp, logging level, code location and the logging information.Compose and send MIME multipart email to an SMTP host.Supported TCP socket connections to non-TLS, TLS and TLS with client authentication.This class provides support for a TLS-secured or non-secured socket server.Class to handle user connections accepted by KSocketServerListener.Simple upper case echo server to show a sample KSocketServerThread implementation.This class adds some convenient methods for starting and stopping Java threads.Simple timer class.